We were missing test cases for i16, i64, and f64. It's not super
critical, but it's also an easy addition, and helps bring coverage of
memory-tracing.cc up (close to 100% now).

Change-Id: Ib8433f8615c900d8665ccbc33e12d6fd05d51336
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2121168Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66878}